Equation of Continuity

A rubber pipe with a diameter of $10 \mathrm{cm}$ is connected to a nozzle $2 \mathrm{cm}$ in diameter. Water flowing through the pipe at a speed of $0.6 {\mathrm{ms}}^{-1}$, comes out like a jet through the nozzle. The backward force of the nozzle is about:

There is a steady water flow in a horizontal tube in which one part has cross-sectional area $A_1$ and the other part has cross-sectional area $A_2$. Assume that water is incompressible. If $\frac{A_1}{A_2}=16\text{,}$ the ratio of the speed $u_1$ in part $1$ and the speed $u_2$ in part $2$, i.e., $\frac{u_1}{u_2}$ is 

Water containing air bubbles flows without turbulence through a horizontal pipe which has a region of narrow cross- section. In this region the bubbles

A water container is kept on a weighing balance. Water from a tap is falling vertically into the container with a volume rate of $Q$. The velocity of water when it hits the water surface is $v$ and comes to rest after hitting. At a particular instant of time, the mass of container and water is $m$. The force registered by the weighing balance at this instant of time is : [assume no splash]